Which of the following obeys Ohm’s law?
A. all metals B. diode only C. all electrolytes D. glass Correct Answer: Option A - all metals
Shadows and eclipses result from the?
A. refraction of light B. reflection of light C. diffraction of light D. rectilinear propagation of light Correct Answer: Option D - rectilinear propagation of light
The electrochemical equivalent of silver is 0.0012g/C. If 36.0g of silver is to be deposited by electrolysis on a surface by passing a steady current for 5mins, the current must be?
A. 6000A B. 100A C. 10A D. 1A Correct Answer: Option B - 100A
The amount of heat needed to raise the temperature of 10kg of Copper by 1K is its?
A. specific heat capacity B. latent heat C. heat capacity D. internal energy Correct Answer: Option C - heat capacity Explanation The heat capacity of a defined system is the amount of heat (usually expressed in calories, kilocalories, or joules) needed to raise the...
A man walks 1km due east and then 1 km due north His displacement?
A. √2km N 45°E B. 1km N 30°E C. 1km N 15°E D. √2km N 60°E Correct Answer: Option A - √2km N 45°E
Which of the following does NOT describe the Image formed by a plane minor?
A. Erect B. Laterally inverted C. Same distance from mirror as object D. Magnified Correct Answer: Option D - Magnified Explanation The image formed by a plane mirror is always virtual (the light rays do not actually come from the image), upright, and of the same...
Which of the following is true of an electrical charge?
A. Positive charge means deficit electrons B. Negative charge means excess of electrons C. electric current means movement of electrons D. All of the above Correct Answer: Option D - All of the above
Natural radioactivity consists of the emission of?
A. α- particles and β-rays B. α- particles and X-rays C. α- particles, β - rays and γ-rays D. γ- rays and X-rays Correct Answer: Option C - α- particles, β - rays and γ-rays
The diagram shown represents a block-and-tackle pulley system on which an effort of W Newtons supports a load of 120.0N. If the efficiency of the machine is 40, then the value of W is?
A. 28.0 B. 48.0N C. 233.0N D. 50.0N Correct Answer: Option D - 50.0N